fixed build error
diff --git a/releng/org.eclipse.m2m.atl.releng.buckminster/releng/atl-build.properties b/releng/org.eclipse.m2m.atl.releng.buckminster/releng/atl-build.properties
index 948395d..dfcf868 100644
--- a/releng/org.eclipse.m2m.atl.releng.buckminster/releng/atl-build.properties
+++ b/releng/org.eclipse.m2m.atl.releng.buckminster/releng/atl-build.properties
@@ -6,7 +6,7 @@
 
 # define the qualifier replacement method
 qualifier.replacement.*=generator:buildTimestamp
-generator.lastModified.format='v'yyyyMMdd-HHmm
+generator.buildTimestamp.format='v'yyyyMMdd-HHmm
 
 target.os=*
 target.ws=*